This message is generated when the number of variables listed in the second argument of Solve is greater than the number of variables that could be determined from the equations.
Off[message] switches off the message; On[message] switches it on. For example: Off[Solve::svars].
Examples
Basic Examples(1)
An error occurs because the number of variables is greater than the number of equations:
Solutions are obtained for all of the variables in this example: